Cert 18 92mins Stars 5

An astonishing commitment to journalism sits at the heart of this extraordinary and harrowing documentary.

The Arab Spring uprising of 2011 threw the Syrian city of Raqqa into the barbarous grip up of ISIS.

We only know the full extent of the medieval barbarity ISIS inflicted on the populace due to the astonishing efforts of four ordinary men who took it on themselves to become citizen journalists.

At great personal cost, their activist group ‘Raqqa Is Being Slaughtered Silently’ put online secretly filmed footage showing the true horrifying spectacle of the ISIS regime.

They ensured the world knew about the public beheadings, crucifixions and executions, all of which we witness here in graphic detail.

This is a fascinating exploration of how the written word has been supplanted by smartphones and the internet as vehicles for political change.

And the dignity, courage and faith demonstrated by the keyboard warriors will haunt you long after the final credits.